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Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Accrued severance balance for termination costs      
Accrued severance, Beginning balance $ 6,161 $ 2,756 $ 3,361
Termination benefits expense 3,959 5,652 5,325
Payments (4,049) (2,247) (5,930)
Accrued severance, Ending balance $ 6,071 $ 6,161 $ 2,756